<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-for指令</title>
</head>

<body>    
    <div id="app">
        <input type="button" value="添加数据" @click="add">
        <input type="button" value="移除数据" @click="remove">
        <ul>
            <!-- <li v-for="item in arr"> -->
            <li v-for="(item, index) in arr">
                黑马程序员校区：[{{index + 1}}] {{ item }}
            </li>
        </ul>
        <h4 v-for="item in vegetables" v-bind:title="item.name">
            {{item.name}}
        </h4>
    </div>
    <!-- 开发环境版本，包含了有帮助的命令行警告。 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el:"#app",
            data:{
                arr:["北京校区", "上海校区", "广州校区", "深圳校区"],
                vegetables:[
                    {name:"蛋炒西红柿"},
                    {name:"西兰花炒蛋"},
                ],
            },
            methods:{
                add:function(){
                    this.vegetables.push({name:"炝土豆丝"});
                },
                remove:function(){
                    this.vegetables.shift();
                },
            },
        })
    </script>
</body>
</html>